This study aimed to compare growth performance of Lowline Angus crossbred with Thai native cattle under a grazing system with supplementation of fermented cassava starch residue. Three Ruzi grass sub-fields were used for twenty heads of beef cattle for a 7-month experiment from February to August 2017. Yeast, molasses, and urea–fermented cassava starch residue was offered at 1.50% BW of animal. Blood metabolite and fecal composition were determined for health and nutritional stage assessment. The temperature-humidity index was highest (75.6–84.6) in April. Overall growth rate of beef cattle was not significantly different among breeds except in the first month when the native had greater weight gain than the crossbred. Average daily gain was 353 and 345 g for Thai native and its crossbred with Lowline Angus, respectively. Blood triglyceride concentration sampled at 7 months of the native was higher than that of the crossbred; in contrast, blood cholesterol of the crossbred tended to be higher than that of the native. Other blood metabolites including glucose, cholesterol, urea nitrogen, creatinine, total protein, albumin, and globulin were comparable between breeds. The native and the crossbred were similar in fecal composition, ruminal fermentation end-products (ammonia nitrogen and volatile fatty acids), and microbial population. Therefore, under grazing condition with low-quality feed supplementation, Thai native beef cattle and its Lowline Angus crossbred had similar growth rate, health, and nutritional status.

这项研究的目的是在放牧系统中添加木薯淀粉发酵残渣，比较低矮安格斯与泰国本地牛杂交的生长性能。从2017年2月至2017年8月，三个Ruzi草子田地用于二十头肉牛，进行了为期7个月的实验。提供的酵母，糖蜜和尿素发酵的木薯淀粉残留量为动物体重的1.5％。确定血液代谢产物和粪便成分，以进行健康和营养阶段评估。4月的温度湿度指数最高（75.6–84.6）。肉牛的总体生长率在各个品种之间没有显着差异，除了在第一个月中，当地人的体重增加大于杂交品种。泰国本地人和与Lowline Angus杂交的泰国本地人的平均日增重分别为353和345 g。原始人7个月时采集的血液甘油三酸酯浓度高于杂种。相反，杂种的血液胆固醇倾向于高于天然的。不同品种的其他血液代谢物，包括葡萄糖，胆固醇，尿素氮，肌酐，总蛋白，白蛋白和球蛋白，具有可比性。天然和杂种在粪便组成，瘤胃发酵终产物（氨氮和挥发性脂肪酸）和微生物种群方面相似。因此，在放牧条件下添加低质量饲料的情况下，泰国本地肉牛及其低位安格斯杂交种的生长速度，健康状况和营养状况相似。杂种的血液胆固醇往往高于天然胆固醇。不同品种的其他血液代谢物，包括葡萄糖，胆固醇，尿素氮，肌酐，总蛋白，白蛋白和球蛋白，具有可比性。天然和杂种在粪便组成，瘤胃发酵终产物（氨氮和挥发性脂肪酸）和微生物种群方面相似。因此，在放牧条件下添加低质量饲料的情况下，泰国本地肉牛及其低位安格斯杂交种的生长速度，健康状况和营养状况相似。杂种的血液胆固醇倾向于高于天然。不同品种的其他血液代谢物，包括葡萄糖，胆固醇，尿素氮，肌酐，总蛋白，白蛋白和球蛋白，具有可比性。天然和杂种在粪便组成，瘤胃发酵终产物（氨氮和挥发性脂肪酸）和微生物种群方面相似。因此，在放牧条件下添加低质量饲料的情况下，泰国本地肉牛及其低位安格斯杂交种的生长速度，健康状况和营养状况相似。瘤胃发酵终产物（氨氮和挥发性脂肪酸）和微生物种群。因此，在放牧条件下添加低质量饲料的情况下，泰国本地肉牛及其低位安格斯杂交种的生长速度，健康状况和营养状况相似。瘤胃发酵终产物（氨氮和挥发性脂肪酸）和微生物种群。因此，在放牧条件下添加低质量饲料的情况下，泰国本地肉牛及其低位安格斯杂交种的生长速度，健康状况和营养状况相似。